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Drain Plug With Disengagement Sealing Means - Patent 4503934

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This invention is in the field of drain plugs and in particular those used in sealing oil pans. Vehicle oil pans include a bottom wall provided with a drain hole having a drain plug removably mounted therein. In order to change the vehicle oil,the drain plug must be removed and the oil within the pan allowed to drain through the hole. As the plug is removed, the hot oil quickly flows through the hole and onto the mechanic's hand untightening and removing the plug from the pan. Disclosedherein is a drain plug having a gasket mounted to the distal end of the plug threaded shank to allow the mechanic to rotatably unloosen the drain plug and then quickly pull along the longitudinal axis of the plug allowing the gasket to temporarily sealthe hole prior to removal of the plug and gasket from the hole. As a result, the flow of oil through the hole is temporarily stopped allowing the mechanic to remove the plug as well as his hand from the vicinity of the drain hole.SUMMARY OF THE INVENTIONOne embodiment of the present invention is a plug mountable to an interally threaded hole comprising a main body with an enlarged wrench engageable head and a shank integrally connected together, the shank having external threads thereon and alongitudinal axis extending centrally therethrough, and a gasket mounted to an end of the shank farthest from the head and sized to sealingly engage the internally threaded hole as the external threads are disengaged therefrom limiting drainage throughthe hole until the main body is pulled in the direction of the axis disengaging the gasket from the hole.Another embodiment of the present invention is an oil pan with an internally threaded drain hole, a main body with an enlarged wrench engageable head and a shank integrally connected together, the shank having external threads thereon and alongitudinal axis extending centrally therethrough, and a gasket mounted to an end of the shank farthest from the head and sized to sealingly engage the inter

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